Lead developer for Compiz, Sam Spilsbury, says he sees little need to develop Compiz for Wayland due to the increasing fragmentation of the Linux ecosystem. Spilsbury writes "What does compiz actually provide to users of these systems? [...] None of this functionality that user wants really depends on our compositing engine. There's nothing so special about our compositing engine that gives it a reason to exist [...] This is the real practical toll of fragmentation amongst the Linux ecosystem. It's not just that there are multiple implementations of the wheel. There are multiple implementations of entire cars which do almost the same thing, but a little different from everyone else. Some say this is the free software's greatest strength. Now that I know the personal and technical toll of fragmentation, I see it as its greatest weakness."

Cars are very like products assembled from basically the same parts. I fail to see how this is different from Linux based distributions which are assembled from basically the same parts.

It's more than just common parts. A lot of cars on the market today - even from different manufacturers - are pretty much the same car, barring a few styling differences. A VW Scirocco is a Golf with a bodykit. Half the Mazda range share the chassis and most of the internals with equivalent Ford models. Collaboration between Toyota and Subaru results in near-identical sports cars, almost indistinguishable to the casual eye.